How to use this calculator
- Enter project values using the units shown beside each field.
- Select Calculate to update the main estimate and supporting results.
- Review the interpretation and test realistic high and low assumptions.
#1012 · Energy & Environment Tool
Community Solar Annual Output Calculator
Estimate annual electricity production from a community solar array using rated capacity, local peak sun hours, and an overall performance ratio.
Calculator
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Formula
Annual output (kWh) = capacity (kW) × peak sun hours/day × 365 × performance ratio
What the result means
Annual output represents the estimated AC electricity generated by the complete array over one typical year.
Peak sun hours are not daylight hours. Use a local solar-resource estimate and a performance ratio that includes temperature, wiring, inverter, shading, soiling, and availability losses.
Example calculation
A 1,000 kW array with 4.5 peak sun hours per day and an 82% performance ratio produces about 1,346,850 kWh per year.
Tips for better results
Base the performance ratio on design software or measured operating data, and use a multi-year solar resource average rather than a single unusually sunny year.
Keep units and AC/DC or gross/net definitions consistent across every input.
Frequently asked questions
What does this community solar annual output estimate show?
Annual output represents the estimated AC electricity generated by the complete array over one typical year.
Can I use this result for a final investment or engineering decision?
No. Use it as a screening estimate and confirm project-specific assumptions with qualified engineering, financial, utility, and tax professionals.
Why might actual results differ?
Weather, equipment performance, outages, degradation, curtailment, tariffs, operating strategy, and data-basis differences can all change actual outcomes.
Should I use AC or DC solar capacity?
Use the capacity basis specified by the input label and keep every production or performance value on the same basis.
How often should I update the estimate?
Update it whenever design ratings, resource studies, operating data, tariffs, incentives, battery condition, or project costs change.
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Quick reference
| Item | Guidance |
|---|---|
| Best use | Early-stage screening and scenario comparison |
| Update when | Design, resource, cost, tariff, or operating assumptions change |
| Decision quality | Confirm with project-specific engineering and financial analysis |